return cached values

backend/app/get_travel_time.py

@@ -8,6 +8,7 @@
 import math
 import pandas
 import random
+from app.getGitHash import getGitHash
 
 # the way we currently do it
 def mean_daily_mean(obs):
@@ -20,9 +21,29 @@ def mean_daily_mean(obs):
     # average the days together
     return numpy.mean(daily_means)
 
+def checkCache(uri,hash):
+    query = f'''
+        SELECT results
+        FROM nwessel.cached_travel_times
+        WHERE uri_string = %(uri)s AND commit_hash = %(hash)s
+    '''
+    connection = getConnection()
+    with connection:
+        with connection.cursor() as cursor:
+            cursor.execute(query, {'uri': uri, 'hash': hash})
+            for (record,) in cursor: # will skip if no records
+                return record # there could only be one
+
 def get_travel_time(start_node, end_node, start_time, end_time, start_date, end_date, include_holidays, dow_list):
     """Function for returning data from the aggregate-travel-times/ endpoint"""
 
+    # first check the cache
+    cacheURI = f'/{start_node}/{end_node}/{start_time}/{end_time}/{start_date}/{end_date}/{str(include_holidays).lower()}/{"".join(map(str,dow_list))}'
+    cachedValue = checkCache(cacheURI,getGitHash())
+
+    if cachedValue:
+        return cachedValue
+
     holiday_clause = ''
     if not include_holidays:
         holiday_clause = '''AND NOT EXISTS (

backend/app/routes.py

@@ -116,13 +116,8 @@ def get_here_links_between_two_nodes(network, from_node_id, to_node_id):
     })
 
 
-
-
 # test URL /aggregate-travel-times/30310940/30310942/9/12/2020-05-01/2020-06-01/true/2
-@app.route(
-    '/aggregate-travel-times/<start_node>/<end_node>/<start_time>/<end_time>/<start_date>/<end_date>/<include_holidays>/<dow_str>',
-    methods=['GET']
-)
+@app.route('/aggregate-travel-times/<start_node>/<end_node>/<start_time>/<end_time>/<start_date>/<end_date>/<include_holidays>/<dow_str>')
 def aggregate_travel_times(start_node, end_node, start_time, end_time, start_date, end_date, include_holidays, dow_str):
     """
     Return averaged travel times given the specified parameters.